//! 业务处理器模块
//! 实现具体的业务逻辑处理

use std::collections::HashMap;
use std::sync::Arc;
use uuid::Uuid;

use crate::models::{
    token_model::TokenModel,
    operate_result::OperateResult,
    data_source_load_options::DataSourceLoadOptions,
    collect_update_data::CollectUpdateData,
    object_set_data::ObjectSetData,
    bucket_item_data::BucketItemData,
};

use super::message::{HubMessage, HubResponse};
use super::MessageHandler;


/// Thing 处理器
pub struct ThingHandler {
    // TODO: 添加数据访问层
}

impl ThingHandler {
    pub fn new() -> Self {
        Self {}
    }
}

#[async_trait::async_trait]
impl MessageHandler for ThingHandler {
    async fn handle_message(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        match message.target.as_deref() {
            Some("ThingLoad") => self.handle_thing_load(message, token).await,
            Some("ThingInsert") => self.handle_thing_insert(message, token).await,
            Some("ThingUpdate") => self.handle_thing_update(message, token).await,
            Some("ThingDelete") => self.handle_thing_delete(message, token).await,
            _ => Err(anyhow::anyhow!("未知的 Thing 方法: {:?}", message.target)),
        }
    }
    
    fn name(&self) -> &'static str {
        "ThingHandler"
    }
}

impl ThingHandler {
    async fn handle_thing_load(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        let arguments = message.arguments.unwrap_or_default();
        
        if arguments.is_empty() {
            return Err(anyhow::anyhow!("ThingLoad 缺少参数"));
        }
        
        // TODO: 实现实际的 Thing 加载逻辑
        tracing::info!("ThingLoad: {:?}", arguments[0]);
        
        let result = OperateResult::success(serde_json::json!({
            "things": [],
            "total": 0
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
    
    async fn handle_thing_insert(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        // TODO: 实现实际的 Thing 插入逻辑
        let result = OperateResult::success(serde_json::json!({
            "id": Uuid::new_v4().to_string()
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
    
    async fn handle_thing_update(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        // TODO: 实现实际的 Thing 更新逻辑
        let result = OperateResult::success(serde_json::json!({
            "updated": true
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
    
    async fn handle_thing_delete(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        // TODO: 实现实际的 Thing 删除逻辑
        let result = OperateResult::success(serde_json::json!({
            "deleted": true
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
}

/// Collection 处理器
pub struct CollectionHandler {
    // TODO: 添加数据访问层
}

impl CollectionHandler {
    pub fn new() -> Self {
        Self {}
    }
}

#[async_trait::async_trait]
impl MessageHandler for CollectionHandler {
    async fn handle_message(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        match message.target.as_deref() {
            Some("CollectionLoad") => self.handle_collection_load(message, token).await,
            Some("CollectionInsert") => self.handle_collection_insert(message, token).await,
            Some("CollectionUpdate") => self.handle_collection_update(message, token).await,
            Some("CollectionDelete") => self.handle_collection_delete(message, token).await,
            _ => Err(anyhow::anyhow!("未知的 Collection 方法: {:?}", message.target)),
        }
    }
    
    fn name(&self) -> &'static str {
        "CollectionHandler"
    }
}

impl CollectionHandler {
    async fn handle_collection_load(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        let arguments = message.arguments.unwrap_or_default();
        
        if arguments.is_empty() {
            return Err(anyhow::anyhow!("CollectionLoad 缺少参数"));
        }
        
        let options: DataSourceLoadOptions = serde_json::from_value(arguments[0].clone())?;
        
        // TODO: 实现实际的 Collection 加载逻辑
        tracing::info!("CollectionLoad: {:?}", options);
        
        let result = OperateResult::success(serde_json::json!({
            "collections": [],
            "total": 0
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
    
    async fn handle_collection_insert(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        // TODO: 实现实际的 Collection 插入逻辑
        let result = OperateResult::success(serde_json::json!({
            "id": Uuid::new_v4().to_string()
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
    
    async fn handle_collection_update(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        let arguments = message.arguments.unwrap_or_default();
        
        if arguments.is_empty() {
            return Err(anyhow::anyhow!("CollectionUpdate 缺少参数"));
        }
        
        let update_data: CollectUpdateData = serde_json::from_value(arguments[0].clone())?;
        
        // TODO: 实现实际的 Collection 更新逻辑
        tracing::info!("CollectionUpdate: {:?}", update_data);
        
        let result = OperateResult::success(serde_json::json!({
            "updated": true
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
    
    async fn handle_collection_delete(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        // TODO: 实现实际的 Collection 删除逻辑
        let result = OperateResult::success(serde_json::json!({
            "deleted": true
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
}

/// Object 处理器
pub struct ObjectHandler {
    // TODO: 添加数据访问层
}

impl ObjectHandler {
    pub fn new() -> Self {
        Self {}
    }
}

#[async_trait::async_trait]
impl MessageHandler for ObjectHandler {
    async fn handle_message(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        match message.target.as_deref() {
            Some("ObjectLoad") => self.handle_object_load(message, token).await,
            Some("ObjectInsert") => self.handle_object_insert(message, token).await,
            Some("ObjectUpdate") => self.handle_object_update(message, token).await,
            Some("ObjectDelete") => self.handle_object_delete(message, token).await,
            _ => Err(anyhow::anyhow!("未知的 Object 方法: {:?}", message.target)),
        }
    }
    
    fn name(&self) -> &'static str {
        "ObjectHandler"
    }
}

impl ObjectHandler {
    async fn handle_object_load(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        // TODO: 实现实际的 Object 加载逻辑
        let result = OperateResult::success(serde_json::json!({
            "objects": [],
            "total": 0
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
    
    async fn handle_object_insert(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        let arguments = message.arguments.unwrap_or_default();
        
        if arguments.is_empty() {
            return Err(anyhow::anyhow!("ObjectInsert 缺少参数"));
        }
        
        let set_data: ObjectSetData = serde_json::from_value(arguments[0].clone())?;
        
        // TODO: 实现实际的 Object 插入逻辑
        tracing::info!("ObjectInsert: {:?}", set_data);
        
        let result = OperateResult::success(serde_json::json!({
            "id": Uuid::new_v4().to_string()
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
    
    async fn handle_object_update(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        // TODO: 实现实际的 Object 更新逻辑
        let result = OperateResult::success(serde_json::json!({
            "updated": true
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
    
    async fn handle_object_delete(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        // TODO: 实现实际的 Object 删除逻辑
        let result = OperateResult::success(serde_json::json!({
            "deleted": true
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
}

/// Bucket 处理器
pub struct BucketHandler {
    // TODO: 添加数据访问层
}

impl BucketHandler {
    pub fn new() -> Self {
        Self {}
    }
}

#[async_trait::async_trait]
impl MessageHandler for BucketHandler {
    async fn handle_message(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        match message.target.as_deref() {
            Some("BucketLoad") => self.handle_bucket_load(message, token).await,
            Some("BucketInsert") => self.handle_bucket_insert(message, token).await,
            Some("BucketUpdate") => self.handle_bucket_update(message, token).await,
            Some("BucketDelete") => self.handle_bucket_delete(message, token).await,
            _ => Err(anyhow::anyhow!("未知的 Bucket 方法: {:?}", message.target)),
        }
    }
    
    fn name(&self) -> &'static str {
        "BucketHandler"
    }
}

impl BucketHandler {
    async fn handle_bucket_load(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        // TODO: 实现实际的 Bucket 加载逻辑
        let result = OperateResult::success(serde_json::json!({
            "buckets": [],
            "total": 0
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
    
    async fn handle_bucket_insert(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        let arguments = message.arguments.unwrap_or_default();
        
        if arguments.is_empty() {
            return Err(anyhow::anyhow!("BucketInsert 缺少参数"));
        }
        
        let item_data: BucketItemData = serde_json::from_value(arguments[0].clone())?;
        
        // TODO: 实现实际的 Bucket 插入逻辑
        tracing::info!("BucketInsert: {:?}", item_data);
        
        let result = OperateResult::success(serde_json::json!({
            "id": Uuid::new_v4().to_string()
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
    
    async fn handle_bucket_update(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        // TODO: 实现实际的 Bucket 更新逻辑
        let result = OperateResult::success(serde_json::json!({
            "updated": true
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
    
    async fn handle_bucket_delete(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        // TODO: 实现实际的 Bucket 删除逻辑
        let result = OperateResult::success(serde_json::json!({
            "deleted": true
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
}

/// 认证处理器
pub struct AuthHandler {
    // TODO: 添加认证服务
}

impl AuthHandler {
    pub fn new() -> Self {
        Self {}
    }
}

#[async_trait::async_trait]
impl MessageHandler for AuthHandler {
    async fn handle_message(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        match message.target.as_deref() {
            Some("TokenAuth") => self.handle_token_auth(message, token).await,
            _ => Err(anyhow::anyhow!("未知的认证方法: {:?}", message.target)),
        }
    }
    
    fn name(&self) -> &'static str {
        "AuthHandler"
    }
}

impl AuthHandler {
    async fn handle_token_auth(
        &self,
        message: HubMessage,
        _token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        let arguments = message.arguments.unwrap_or_default();
        
        if arguments.is_empty() {
            return Err(anyhow::anyhow!("TokenAuth 缺少参数"));
        }
        
        let token_data = &arguments[0];
        
        // TODO: 实现实际的 Token 验证逻辑
        // 这里暂时模拟验证成功
        let result = OperateResult::success(serde_json::json!({
            "authenticated": true,
            "userId": 1,
            "belongId": 1
        }));
        
        Ok(HubResponse::success(message.invocation_id, serde_json::to_value(result)?))
    }
}

/// 处理器管理器
pub struct HandlerManager {
    handlers: HashMap<&'static str, Arc<dyn MessageHandler>>,
}

impl HandlerManager {
    pub fn new() -> Self {
        let mut handlers = HashMap::new();
        
        // 注册所有处理器
        handlers.insert("ThingHandler", Arc::new(ThingHandler::new()) as Arc<dyn MessageHandler>);
        handlers.insert("CollectionHandler", Arc::new(CollectionHandler::new()) as Arc<dyn MessageHandler>);
        handlers.insert("ObjectHandler", Arc::new(ObjectHandler::new()) as Arc<dyn MessageHandler>);
        handlers.insert("BucketHandler", Arc::new(BucketHandler::new()) as Arc<dyn MessageHandler>);
        handlers.insert("AuthHandler", Arc::new(AuthHandler::new()) as Arc<dyn MessageHandler>);
        
        Self { handlers }
    }
    
    /// 根据方法名获取处理器
    pub fn get_handler(&self, method_name: &str) -> Option<Arc<dyn MessageHandler>> {
        match method_name {
            "TokenAuth" => self.handlers.get("AuthHandler").cloned(),
            method if method.starts_with("Thing") => self.handlers.get("ThingHandler").cloned(),
            method if method.starts_with("Collection") => self.handlers.get("CollectionHandler").cloned(),
            method if method.starts_with("Object") => self.handlers.get("ObjectHandler").cloned(),
            method if method.starts_with("Bucket") => self.handlers.get("BucketHandler").cloned(),
            _ => None,
        }
    }
    
    /// 处理消息
    pub async fn handle_message(
        &self,
        message: HubMessage,
        token: Option<TokenModel>,
    ) -> anyhow::Result<HubResponse> {
        if let Some(target) = &message.target {
            if let Some(handler) = self.get_handler(target) {
                handler.handle_message(message, token).await
            } else {
                Err(anyhow::anyhow!("找不到对应的处理器: {}", target))
            }
        } else {
            Err(anyhow::anyhow!("消息缺少目标方法"))
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    
    #[tokio::test]
    async fn test_handler_manager() {
        let manager = HandlerManager::new();
        
        // 测试获取处理器
        assert!(manager.get_handler("ThingLoad").is_some());
        assert!(manager.get_handler("CollectionLoad").is_some());
        assert!(manager.get_handler("UnknownMethod").is_none());
    }
}